CD4 and pneumocystosis: As shown in Fig. 5, for the whole subjects, the odds ratios for PJP versus P. jirovecii-colonization were 2.314, 2.554, 2.628, 3.244, 3.367, 3.481, 3.769, and 5.375, respectively, when the proportion of CD4+ T cells in T cells < 30%, the proportion of CD8+ T cells in T cells > 40%, lymphocyte counts < 1.0×109/L, ESR > 15 mm/h, CD4+T/CD8+T < 1.4 or > 2.0, CRP > 10 mg/L, the proportion of B cells in lymphocytes < 9% and had a history of treatment with glucocorticoids within 2 weeks.